This is about as esoteric as we can get in terms of adding a part to the AC Catalog. But when you need it you need it.
These were affixed to Bosch H1 Headlights to provide how to adjust the two beams. If you're refurbishing H1's these are the final touch providing perfect similitude (I think that I remember that word from a Freshman college class in Western Literature ( UCSB ) .
 
And here it is in English;
DANGER First adjust the low beam, then correct the high beam Marking of the adjusting screws on the washer: Low beam with “A” and.” A”, high beam with “F” and “F”
We include clear top stickers for water protection.